docs: more clear about stop plugins error.

apps/emqx_conf/i18n/emqx_conf_schema.conf

@@ -944,8 +944,8 @@ until the RPC connection is considered lost."""
       zh: """需要持久化到文件的日志处理进程列表。默认只有 default 一个处理进程。"""
     }
     label {
-      en: "Log Handlers List"
-      zh: "日志 Handler 列表"
+      en: "File Handlers"
+      zh: "File Handlers"
     }
   }
 
@@ -1136,7 +1136,9 @@ When drop mode is activated or deactivated, a message is printed in the logs."""
   log_rotation_enable {
     desc {
       en: """Enable log rotation feature."""
-      zh: """启用日志轮换功能。"""
+      zh: """启用日志轮换功能。启动后生成日志文件后缀会加上对应的索引数字，比如：log/emqx.log.1。
+系统会默认生成<code>*.siz/*.idx<code>用于记录日志位置，请不要手动修改这两个文件。
+"""
     }
     label {
       en: "Rotation Enable"
@@ -1147,7 +1149,7 @@ When drop mode is activated or deactivated, a message is printed in the logs."""
   log_rotation_count {
     desc {
       en: """Maximum number of log files."""
-      zh: """最大日志文件数。"""
+      zh: """轮换的最大日志文件数。"""
     }
     label {
       en: "Max Log Files Number"

apps/emqx_plugins/src/emqx_plugins.erl

@@ -578,7 +578,8 @@ ensure_apps_stopped(#{<<"rel_apps">> := Apps}) ->
         {ok, Left} ->
             ?SLOG(warning, #{
                 msg => "unabled_to_stop_plugin_apps",
-                apps => Left
+                apps => Left,
+                reason => "running_apps_still_depends_on_this_apps"
             }),
             ok;
         {error, Reason} ->